MediumVulnerability

CVE-2026-28415: Gradio OAuth open redirect via _target_url on /logout and /login/callback

Source: NVD(opens in a new tab)
Identifier: CVE-2026-28415
Published: February 27, 2026
Record updated: October 9, 2026

Affected: gradio < 6.6.0
Fixed in: 6.6.0
released February 17, 2026, 10 days before disclosure
Known exploitation: Not listed in the CISA Known Exploited Vulnerabilities catalog at the last check.
EPSS: 0.3%

Summary

CVE-2026-28415 affects Gradio, an open-source Python package for prototyping, before version 6.6.0. The _redirect_to_target() function in Gradio's OAuth flow accepts an unvalidated _target_url query parameter, allowing redirection to arbitrary external URLs via the /logout and /login/callback endpoints on apps with OAuth enabled, such as apps running on Hugging Face Spaces with gr.LoginButton.

Mitigation

Starting in version 6.6.0, the _target_url parameter is sanitized to only use the path, query, and fragment, stripping any scheme or host.

Details

Scores and exploitation

CVSS score: 4.3(medium)
Patch available: Yes
EPSS: 0.3%Estimated probability that this CVE is exploited in the next 30 days, from the FIRST Exploit Prediction Scoring System. Read on November 4, 2026.

Weaknesses and techniques

Weakness (CWE): CWE-200
CWE-284
CWE-330
CWE-601
Attack pattern (CAPEC): CAPEC-116
CAPEC-20

Affected

Packages: gradio@< 6.6.0 (fixed: 6.6.0)
Vendors: HuggingFace

Classification

Attack type: Other
Attack sophistication: Trivial
AI component targeted: Framework
Impact: Confidentiality,
Integrity
Labels: security

How this record was produced

Summaries, mitigations and labels on this page are generated automatically from the source. The linked source is authoritative. The source gives this advisory a description and no title, so the title above is a headline generated from the source text.

Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-28415

First tracked: February 27, 2026 at 07:07 PM ET, from NVD/CVE Database

Classifier: claude-haiku-5-5, prompt v4

Classifier confidence: 80% (self-assessed)

Affected packages in the Exposure Registry

Matched by package name and ecosystem. Each entry shows whether the package delegates to a language model and how many tracked packages depend on it.

gradioPyPILLM dependency since 2023-03-14 · 11 tracked dependents

Summary

Mitigation

Affected packages in the Exposure Registry

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